diff --git a/core/includes/common.inc b/core/includes/common.inc
index 4a789c8..1307f5e 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -145,49 +145,6 @@
 const LOCALE_PLURAL_DELIMITER = "\03";
 
 /**
- * Adds content to a specified region.
- *
- * @param $region
- *   Page region the content is added to.
- * @param $data
- *   Content to be added.
- */
-function drupal_add_region_content($region = NULL, $data = NULL) {
-  static $content = array();
-
-  if (isset($region) && isset($data)) {
-    $content[$region][] = $data;
-  }
-  return $content;
-}
-
-/**
- * Gets assigned content for a given region.
- *
- * @param $region
- *   A specified region to fetch content for. If NULL, all regions will be
- *   returned.
- * @param $delimiter
- *   Content to be inserted between imploded array elements.
- */
-function drupal_get_region_content($region = NULL, $delimiter = ' ') {
-  $content = drupal_add_region_content();
-  if (isset($region)) {
-    if (isset($content[$region]) && is_array($content[$region])) {
-      return implode($delimiter, $content[$region]);
-    }
-  }
-  else {
-    foreach (array_keys($content) as $region) {
-      if (is_array($content[$region])) {
-        $content[$region] = implode($delimiter, $content[$region]);
-      }
-    }
-    return $content;
-  }
-}
-
-/**
  * Gets the name of the currently active installation profile.
  *
  * When this function is called during Drupal's initial installation process,
@@ -237,6 +194,9 @@ function drupal_get_profile() {
  *   An array of all stored HEAD elements.
  *
  * @see \Drupal\Core\Render\Element\HtmlTag::preRenderHtmlTag()
+ *
+ * @deprecated in Drupal 8.0.x, will be removed before Drupal 8.0.0
+ *   Use #attached on render arrays.
  */
 function drupal_add_html_head($data = NULL, $key = NULL) {
   $stored_head = &drupal_static(__FUNCTION__, array());
@@ -258,6 +218,9 @@ function drupal_add_html_head($data = NULL, $key = NULL) {
  *
  * @return string|array
  *   Return the rendered HTML head or the elements itself.
+ *
+ * @deprecated in Drupal 8.0.x, will be removed before Drupal 8.0.0
+ *   Use #attached on render arrays.
  */
 function drupal_get_html_head($render = TRUE) {
   $elements = drupal_add_html_head();
@@ -279,6 +242,9 @@ function drupal_get_html_head($render = TRUE) {
  *   An internal system path or a fully qualified external URL of the feed.
  * @param $title
  *   The title of the feed.
+ *
+ * @deprecated in Drupal 8.0.x, will be removed before Drupal 8.0.0
+ *   Use #attached on render arrays.
  */
 function drupal_add_feed($url = NULL, $title = '') {
   $stored_feed_links = &drupal_static(__FUNCTION__, array());
@@ -291,6 +257,9 @@ function drupal_add_feed($url = NULL, $title = '') {
 
 /**
  * Gets the feed URLs for the current page.
+ *
+ * @deprecated in Drupal 8.0.x, will be removed before Drupal 8.0.0
+ *   Use #attached on render arrays.
  */
 function drupal_get_feeds() {
   $feeds = drupal_add_feed();
@@ -908,6 +877,9 @@ function base_path() {
  *   Associative array of element attributes including 'href' and 'rel'.
  * @param $header
  *   Optional flag to determine if a HTTP 'Link:' header should be sent.
+ *
+ * @deprecated in Drupal 8.0.x, will be removed before Drupal 8.0.0
+ *   Use #attached on render arrays.
  */
 function drupal_add_html_head_link($attributes, $header = FALSE) {
   $element = array(
@@ -2057,6 +2029,9 @@ function drupal_process_states(&$elements) {
  *
  * @see \Drupal\Core\Asset\LibraryDiscovery
  * @see hook_library_info_alter()
+ *
+ * @deprecated in Drupal 8.0.x, will be removed before Drupal 8.0.0
+ *   Use #attached on render arrays.
  */
 function _drupal_add_library($library_name, $every_page = NULL) {
   $added = &drupal_static(__FUNCTION__, array());
diff --git a/core/modules/system/src/Tests/Common/RegionContentTest.php b/core/modules/system/src/Tests/Common/RegionContentTest.php
deleted file mode 100644
index 9b21924..0000000
--- a/core/modules/system/src/Tests/Common/RegionContentTest.php
+++ /dev/null
@@ -1,49 +0,0 @@
-<?php
-
-/**
- * @file
- * Definition of Drupal\system\Tests\Common\RegionContentTest.
- */
-
-namespace Drupal\system\Tests\Common;
-
-use Drupal\simpletest\WebTestBase;
-
-/**
- * Tests setting and retrieving content from theme regions.
- *
- * @group Common
- */
-class RegionContentTest extends WebTestBase {
-  /**
-   * Tests setting and retrieving content for theme regions.
-   */
-  function testRegions() {
-    $theme_key = \Drupal::theme()->getActiveTheme()->getName();
-
-    $block_regions = array_keys(system_region_list($theme_key));
-    $delimiter = $this->randomMachineName(32);
-    $values = array();
-    // Set some random content for each region available.
-    foreach ($block_regions as $region) {
-      $first_chunk = $this->randomMachineName(32);
-      drupal_add_region_content($region, $first_chunk);
-      $second_chunk = $this->randomMachineName(32);
-      drupal_add_region_content($region, $second_chunk);
-      // Store the expected result for a drupal_get_region_content call for this region.
-      $values[$region] = $first_chunk . $delimiter . $second_chunk;
-    }
-
-    // Ensure drupal_get_region_content returns expected results when fetching all regions.
-    $content = drupal_get_region_content(NULL, $delimiter);
-    foreach ($content as $region => $region_content) {
-      $this->assertEqual($region_content, $values[$region], format_string('@region region text verified when fetching all regions', array('@region' => $region)));
-    }
-
-    // Ensure drupal_get_region_content returns expected results when fetching a single region.
-    foreach ($block_regions as $region) {
-      $region_content = drupal_get_region_content($region, $delimiter);
-      $this->assertEqual($region_content, $values[$region], format_string('@region region text verified when fetching single region.', array('@region' => $region)));
-    }
-  }
-}